I think that in pediatrics, probably like many specialties, the numbers are often fewer than they would be for adult caregivers or adult specialists to serve a similarly sized population.
I don't know the exact numbers in your riding, but I would suspect that the total number of physicians available at that hospital to provide pediatric services may have been under some strain, and perhaps it got to a critical number, such that there were not enough doctors to provide safe health care.
Again, I don't know the details—